#include<stdio.h>
#include<conio.h>
int main()
{
int i, n;
long S;
S = 0;
i = 1;
printf("\nNhap n: ");
scanf("%d", &n);
while(i <= n)
{
S = S + i * i;
i++;
}
printf("i = %d", i);
printf("\nTong 1^2 + 2^2 + ... + %d^2 la: %ld", n, S);
/*int n,i;
int sum=0;
printf("Enter the n i.e. max values of series: ");
scanf("%d",&n);
sum = (n * (n + 1) * (2 * n + 1 )) / 6;
printf("Sum of the series : ");
for(i =1;i<=n;i++){
if (i != n)
printf("%d^2 + ",i);
else
printf("%d^2 = %d ",i,sum);
}*/
getch();
return 0;
}